UltraPath

If UltraPath is used, retain the default initiator settings. Do not select Use third-party multipath software.

Figure 6-4 Initiator setting when UltraPath is used

Install UltraPath by following instructions in the OceanStor UltraPath for Windows User Guide.

You can log in to Huawei's technical support website (http://support.huawei.com/enterprise/) and enter UltraPath in the search box. Then, select a path from the paths that are automatically displayed to go to the document page. Search for, browse, and download desired documents. To download UltraPath software, click the Software Download tab, and search for and download UltraPath software specific to your product version.

After you install UltraPath, set the trespass policy for LUNs as follows:

This configuration must be performed on all hosts separately. Retain the default settings for other parameters.

• For UltraPath earlier than 21.2.0, it is recommended that you run the set luntrespass command to disable the trespass function.

  UltraPath CLI #3 >set luntrespass=off array_id=0
  
  The current configuration will overwrite the configuration of all VLUNs in this array. 
  Are you sure you want to continue? [y,n]: y
  
  Succeeded in executing the command.

  The command format is set luntrespass={ on | off } [ array_id=ID | vlun_id={ ID | ID1,ID2... | ID1-ID2 } ]. Table 6-3 describes the key parameters in the command.

  Table 6-3 Parameter description

  Parameter	Description	Default Value
  { on | off }	Trespass policy of LUNs on: Switchover of LUNs' working controller is enabled. off: Switchover of LUNs' working controller is disabled.	on
  array_id=ID	ID of the storage array You can run the show array command to query the ID of the storage array.	None
  vlun_id={ ID | ID1,ID2... | ID1-ID2 }	ID of the virtual LUN You can run the show vlun type=all command to query the IDs of all virtual LUNs.	None

• For UltraPath 21.2.0 and later, it is recommended that you retain the default settings (the trespass function is disabled by default).

If a path switchover takes a long period of time, you can modify the timeout time for a driver by following instructions in How Do I Modify the Timeout Time for the FC HBA Port Driver? or How Do I Modify the iSCSI Initiator's Driver Timeout Time?, thereby shortening I/O interruption.